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Retirement Benefits
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Retirement Benefits Retirement Benefits
The components of net periodic benefit cost related to pension benefits for the three and six months ended June 30, 2021 and 2020 were as follows:
 Three Months Ended June 30,
20212020
Dollars in millionsUnited StatesInt’lUnited StatesInt’l
Components of net periodic pension cost (benefit)
Interest cost$1 $8 $— $9 
Expected return on plan assets(1)(22)(1)(14)
Amortization of prior service cost— 1 — 1 
Recognized actuarial loss— 8 1 5 
Net periodic benefit cost (benefit)$— $(5)$— $1 
 Six Months Ended June 30,
20212020
Dollars in millionsUnited StatesInt’lUnited StatesInt’l
Components of net periodic pension cost (benefit)
Interest cost$1 $16 $1 $19 
Expected return on plan assets(2)(43)(2)(29)
Amortization of prior service cost— 1 — 1 
Recognized actuarial loss1 16 1 11 
Net periodic pension cost (benefit)$— $(10)$— $2 
For the six months ended June 30, 2021, we have contributed approximately $24 million of the $50 million we expect to contribute to our plans in 2021.